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We are just finished learning about this in physics. I think the reason L4 and L5 are stable because of the acceleration due to gravity. At L4 its gaining massive amount of speed because it is heading towards the two bodies of mass, and at L5 it looses most of the acceleration, so there is less of a chance to pull it into either of the planets/suns. L3 is percarious(sp?) cause at that point it has the least speed. Its something dealing with Kepler's laws. Its the one that deals with a line sweeps out equal areas in the same amount of time, and that the speed and gravity is greatest at the perihelion and least at the aphelion. Its some crazy shit like that. First person to make sense of it all gets $5.
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<-- I'm with stupid
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